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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/m²
kcal/hr °C
kcal/m hr °C
kcal/m² hr °C

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Heat and Mass Transfer
The value of the wavelength for maximum emissive power is given by

Planck's law
Fourier's law
Wien’s law
Stefan's law

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Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

81
270
3
9

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Heat and Mass Transfer
A composite slab has two layers of different materials with thermal conductivities k₁ and k₂. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be

(k₁ + k₂)
2 k₁ k₂/ (k₁ + k₂)
(k₁ + k₂)/ k₁ k₂
k₁ k₂

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Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

J/m °K sec
W/m °K
Option (B) and (C) above
J/m² sec

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Heat and Mass Transfer
The automobile radiator is a heat exchanger of

Cross flow type
Counter flow type
Parallel flow type
Regenerator type

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MORE MCQ ON Heat and Mass Transfer

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